function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Becking, Leontine E.', 6],
    ['Bettcher, Larissa & Fernandez, Julio C. C. & Gastaldi, Marianela', 1],
    ['David-Colón, Jesús & Zea, Sven & Marín-Casas, Dairo', 5],
    ['Mácola, Rosa & Menegola, Carla', 4],
    ['Rützler, Klaus & Hooper, John N. A.', 3],
    ['Rützler, Klaus & Piantoni, Carla & Van, Rob W. M.', 2],
    ['Sandes, Joana & Moraes, Fernando & Muricy, Guilherme', 6],
    ['Topsent, Émile', 1],
    ['Ugalde, Diana & Fernandez, Julio C. C. & Gómez, Patricia', 2],
    ['Van, Rob W. M.', 3],
    ['Łukowiak, Magdalena', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=34)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 11, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);