function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barrientos, Jose A. & Prieto, Carlos E. & Pina, Silvia', 1],
    ['Barrientos, José Antonio & Brañas, Neus & Mederos, Jorge', 3],
    ['Borges, Paulo A. V. & Gaspar, Clara', 2],
    ['Bosmans, Robert & Cardoso, Pedro & Crespo, Luis Carlos', 3],
    ['Bosmans, Robert & Trotta, Alessio', 2],
    ['Candek, Klemen & Gregoric, Matjaz & Kostanjsek, Rok', 2],
    ['Crespo, Luis C & Domenech, Marc & Enguidanos, Alba', 2],
    ['Crespo, Luis C. & Boieiro, Mario & Cardoso, Pedro', 2],
    ['Della Rocca, Francesca & Stefanelli, Silvia & Cardarelli, Elisa', 1],
    ['Deltshev, Christo & Komnenov, Marjan & Blagoev, Gergin', 6],
    ['Isaia, Marco & Paschetta, Mauro & Chiarle, Alberto', 1],
    ['Paschetta, Mauro & Christille, Claretta & Marguerettaz, Fabio', 1],
    ['Reboleira, Ana Sofia P. S. & Pérez, Antonio José', 2],
    ['Tanasevitch, Andrei V.', 12]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);