function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Calcinai, Barbara & Belfiore, Giuseppe & Pica, Daniela', 1],
    ['Diaz, Maria Cristina & Nuttall, Marissa & Pomponi, Shirley A.', 1],
    ['Ereskovsky, Alexander V.', 2],
    ['Ereskovsky, Alexander V. & Lavrov, Dennis V.', 1],
    ['Johnston, George', 1],
    ['Rützler, Klaus & Piantoni, Carla & Van, Rob W. M.', 1],
    ['Ugalde, Diana & Gómez, Patricia & Simões, Nuno', 1],
    ['Van, Rob W. M.', 2],
    ['Willenz, Philippe & Ereskovsky, Alexander V. & Lavrov, Dennis V.', 3],
    ['Łukowiak, Magdalena', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);