function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Hafidi, Fouzia El & Diamanka, Arfang & Rkhami, Ouafae Berrada', 4],
    ['Lim, Jacqueline Hui Chern & Othman, Mohamad N. A. B.', 3],
    ['Lopes, Daniela A. & Mainenti, Adriana & Sanches, Magda', 4],
    ['Lunaschi, Lia I. & Álvarez, Victor Hugo Merlo', 1],
    ['Mendoza-Garfias, Berenit & García-Prieto, Luis', 3],
    ['Oym, Soo & Wb, Tan & Lhs, Lim', 3],
    ['Soo, O. Y. M. & Tan, W. B. & Lim, Susan Lee Hong', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);