function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Doumas, Panayiotis & Goula, Katerina', 1],
    ['Grabovskaya-Borodina, Alisa E. & Illarionova, Irina D.', 2],
    ['Hess, Hans Ernst & Landolt, Elias & Hirzel, Rosmarie', 11],
    ['Info Flora', 13],
    ['Jarvis, Charlie', 29],
    ['Konrad Lauber & Gerhart Wagner & Andreas Gygax', 10],
    ['Lee, Jong-Won & Yun, Ho-Geun & Hwang, Tae Young & Kim, Kyungmin', 9],
    ['Li, Tian & Chen, You-Sheng', 2],
    ['Li, Xiong & Wu, Lei & Yu, Xun-Lin', 1],
    ['Reich, Dieter & Gutermann, Walter & Bardy, Katharina', 1],
    ['Suh, Soo-Jung', 1],
    ['Xiao, Jia-Wei & Liu, Ting & Li, Wei-Ping & Yang, Xian-Jun', 1],
    ['Xiao, Jia-Wei & Yan, Guo-Jiao & Li, Wei-Ping & Tang, Ming', 1],
    ['Zhang, Guojin & Zhang, Caifei & Hu, Haihua & Gao, Tiangang', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=83)',
    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);