function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Akyazi, Rana & Soysal, Mete & Altunç, Yunus Emre', 1],
    ['Araújo, Marcel Santos De & Feres, Reinaldo José Fazzio', 1],
    ['Barbar, Ziad', 1],
    ['Doġan, Salih', 3],
    ['Erdoğan, Tuğba & Çobanoğlu, Sultan', 1],
    ['Fan, Qing-Hai & Zhang, Zhi-Qiang', 2],
    ['Hernandes, Fabio A. & Feres, Reinaldo J. F.', 2],
    ['Johann, Liana & Carvalho, Gervásio Silva & Majolo, Fernanda', 4],
    ['Ma, Min & Li, Sheng-Cai & Fan, Qing-Hai', 1],
    ['Mohammad-Doustaresharaf, Mojtaba & Bagheri, Mohammad', 2],
    ['Negm, Mohamed W. & Johann, Liana & Ferla, Noeli Juarez', 1],
    ['Sousa, J. M. de & Gondim Jr., M. G. C. & Lofego, A. C.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 12, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);