function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Arce-Pérez, Roberto & Novelo-Gutiérrez, Rodolfo & Fery, Hans', 3],
    ['Darilmaz, Mustafa C. & Kiyak, Suat', 2],
    ['Hájek, Jiří', 1],
    ['Hájek, Jiří & Reiter, Antonín', 3],
    ['Jiang, Zhuo-Yin & Zhao, Shuang & Mai, Zu-Qi & Jia, Feng-Long', 16],
    ['Miller, Kelly B.', 2],
    ['Miller, Kelly B. & Michat, Mariano C. & Ferreira Jr, Nelson', 3],
    ['Perissinotto, Renzo & Bird, Matthew S. & Bilton, David T.', 8],
    ['Ramahandrison, Andriamirado Tahina & Rakouth, Bakolimalala', 2],
    ['Ribera, Ignacio & Hernando, Carles & Cieslak, Alexandra', 3],
    ['Suprayitno, Nano & Narakusumo, Raden Pramesa', 2],
    ['Swezey, O. H.', 1],
    ['Xian, Chunlan & Leong, Chi Man & Luo, Jiuyang & Jia, Fenglong', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=49)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);